package com.heima.app.gateway.filter;


import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Arrays;
import java.util.List;

@Component
public class AuthorizeFilter implements GlobalFilter {
    List<String> urlList = Arrays.asList(
            "/v2/api-docs",
            "/login/in",
            "/login_auth"
    );
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        for (String url : urlList) {
            if (request.getURI().getPath().contains(url))
                return chain.filter(exchange);
        }

        String token = request.getHeaders().getFirst("token");

        if (StringUtils.isNotBlank(token)){
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int i = AppJwtUtil.verifyToken(claimsBody);
            if (i==0||i==-1){
                Integer id = (Integer) claimsBody.get("id");
                ServerHttpRequest newRequest = request.mutate().headers(header -> {
                    header.add("userId", String.valueOf(id));
                }).build();
                exchange.mutate().request(newRequest).build();
                return chain.filter(exchange);
            }
        }

        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return response.setComplete();
    }
}
